Abstract
Innovative technologies are highly pursued for the detection and avoidance of counterfeiting in modern information society. Herein, we report the construction of photo-responsive supramolecular polymers toward fluorescent anti-counterfeit applications, by taking advantage of multicycle anthracene‒endoperoxide switching properties. Due to σ-metalation effect, photo-oxygenation of anthracene to endoperoxide is proceeded under the mild visible light irradiation conditions, while the backward conversion occurs spontaneously at room temperature. Supramolecular polymers are formed with cooperative nucleation‒elongation mechanism, which facilitate fluorescence resonance energy transfer process via two-component co-assembly strategy. Fluorescence resonance energy transfer efficiency is delicately regulated by either light-triggered anthracene‒endoperoxide conversion or vapor-induced monomer–polymer transition, leading to high-contrast fluorescent changes among three different states. On this basis, dual-mode anti-counterfeiting patterns have been successfully fabricated via inkjet printing techniques. Hence, cooperative supramolecular polymerization of photo-fluorochromic molecules represents an efficient approach toward high-performance anti-counterfeit materials with enhanced security reliability, fast response, and ease of operation.
Highlights
Innovative technologies are highly pursued for the detection and avoidance of counterfeiting in modern information society
Due to σ-metalation effect[42,43,44,45], photo-oxygenation of 1 can be rapidly proceeded via the less destructive visible light source, while the backward conversion occurs at room temperature in a spontaneous manner
In summary, we have successfully developed photo-responsive supramolecular polymers on the basis of multicycle anthracene‒ endoperoxide switching
Summary
Innovative technologies are highly pursued for the detection and avoidance of counterfeiting in modern information society. Fluorescence resonance energy transfer efficiency is delicately regulated by either light-triggered anthracene‒endoperoxide conversion or vaporinduced monomer–polymer transition, leading to high-contrast fluorescent changes among three different states On this basis, dual-mode anti-counterfeiting patterns have been successfully fabricated via inkjet printing techniques. Ascribed to the synergistic participation of hydrogen bonding and π‒π stacking interactions, supramolecular polymerization of 1 is expected to feature distinctive nucleation and elongation events[46,47,48,49,50,51,52] It mimics the cooperative process adopted by biological selfassembled systems[53,54], leading to macroscopic fluorescent variations before and after light irradiation. Dual-mode anti-counterfeiting pattern (Fig. 1) in response to the orthogonal stimuli is achieved, which guarantees higher security reliability
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